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Segment Information - Summary of Segment Information (Detail) - KRW (₩)
₩ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Disclosure of operating segments [Line Items]      
Operating revenues ₩ 23,546,929 ₩ 23,120,878 ₩ 22,699,856
Operating income (loss) 1,069,092 1,339,780 1,077,068
Depreciation and Amortization 3,364,502 3,345,266 3,338,598
Operating segments [member]      
Disclosure of operating segments [Line Items]      
Operating revenues 27,217,843 26,699,112 26,427,216
Operating income (loss) 1,112,554 1,378,653 1,096,256
Depreciation and Amortization 3,356,126 3,337,353 3,333,984
Operating segments [member] | Marketing/Customer [member]      
Disclosure of operating segments [Line Items]      
Operating revenues 16,242,552 16,144,415 16,130,454
Operating income (loss) 1,018,593 1,050,053 816,679
Depreciation and Amortization 2,895,930 2,870,161 2,897,876
Operating segments [member] | Finance [member]      
Disclosure of operating segments [Line Items]      
Operating revenues 3,637,917 3,577,549 3,512,721
Operating income (loss) 205,678 208,566 281,477
Depreciation and Amortization 28,827 28,868 25,466
Operating segments [member] | Satellite TV [member]      
Disclosure of operating segments [Line Items]      
Operating revenues 685,822 668,945 668,521
Operating income (loss) 75,373 79,987 97,701
Depreciation and Amortization 99,216 98,895 95,951
Operating segments [member] | All other segments [member]      
Disclosure of operating segments [Line Items]      
Operating revenues 6,651,552 6,308,203 6,115,520
Operating income (loss) (187,090) 40,047 (99,601)
Depreciation and Amortization 332,153 339,429 314,691
Elimination [member]      
Disclosure of operating segments [Line Items]      
Operating revenues (3,670,914) (3,578,234) (3,727,360)
Operating income (loss) (43,462) (38,873) (19,188)
Depreciation and Amortization ₩ 8,376 ₩ 7,913 ₩ 4,614